%0 Journal Article %A B. Kamiński %A %T On extremal and perfect σ-algebras for flows %J Studia Mathematica %D 1998 %P 179-183 %V 129 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-129-2-179-183/ %R 10.4064/sm-129-2-179-183 %G en %F 10_4064_sm_129_2_179_183